With peak power of 54 horsepower in a package of roughly the same dimensions as the FC 250 engine, the FC 350 offers 450-class performance with 250-class size. Superb engineering and manufacturing expertise combine to make the impressive engine that powers the FC 350 to the top of the power output charts. The titanium valves are ultra-lightweight, weighing only 22.4g and have a diameter of 36.3mm each on the intake side, and 22.7g with a diameter of 29.1mm on the exhaust side. Combined with the Diamond Like Carbon (DLC) coated followers, the FC 350 engine is capable of reaching a 13,000 rpm ceiling. The yellow valve cover tops-off a technological marvel. The handlebar mounted map switch is a standard feature and allows the rider to switch between maps while riding, adjusting power delivery and engine performance according to rider fatigue and track conditions.
ENGINE MANAGEMENT SYSTEM
The electronic fuel injection and 44mm throttle body of the Keihin Engine Management System on the 4-stroke models, combine to offer amazing power delivery and efficiency at all engine speeds. The injector was positioned on the bottom of the inlet tract for optimal air-fuel mixture, resulting in crisp throttle response and class-leading power. Great attention was dedicated to ensuring that cleaning and washing the bike will not damage the electronics. The wire harness, lead wire, and high quality sealed critical connectors ensure that a jet wash poses no threat. The throttle position sensor (TPS) is also water resistant and protected.
CRANKSHAFT, CONROD AND PISTON
The plain big end bearing and two force-fitted shells that run directly on the crank pin are lubricated by the engine’s pressure lubrication in order to maintain durability and long service intervals (100 hours before changing con rod, con rod bearing and crank pin). The FC 350’s power output and engine characteristics require the highest quality components, therefore the entire crankshaft, together with the con rod, is produced by industry leader Pankl. The CP-Carrillo forged box-type piston combines maximum performance and reliability with minimum weight, only 270g. The compression ratio is 13.65:1.
All 4-strokes feature a reliable electric-start-only system. The electric starter is a great advantage in every situation, especially in the event of a fall or in a difficult location on track. The increase in weight has been kept to a minimum by eliminating the mounting and components of the kick-starter.